public class ECDSASigner extends java.lang.Object implements ECConstants, DSA
Modifier and Type | Field and Description |
---|---|
(package private) ECKeyParameters |
key |
(package private) java.security.SecureRandom |
random |
Constructor and Description |
---|
ECDSASigner() |
Modifier and Type | Method and Description |
---|---|
private java.math.BigInteger |
calculateE(java.math.BigInteger n,
byte[] message) |
java.math.BigInteger[] |
generateSignature(byte[] message)
generate a signature for the given message using the key we were
initialised with.
|
void |
init(boolean forSigning,
CipherParameters param)
initialise the signer for signature generation or signature
verification.
|
boolean |
verifySignature(byte[] message,
java.math.BigInteger r,
java.math.BigInteger s)
return true if the value r and s represent a DSA signature for
the passed in message (for standard DSA the message should be
a SHA-1 hash of the real message to be verified).
|
ECKeyParameters key
java.security.SecureRandom random
public void init(boolean forSigning, CipherParameters param)
DSA
public java.math.BigInteger[] generateSignature(byte[] message)
generateSignature
in interface DSA
message
- the message that will be verified later.public boolean verifySignature(byte[] message, java.math.BigInteger r, java.math.BigInteger s)
verifySignature
in interface DSA
message
- the message that was supposed to have been signed.r
- the r signature value.s
- the s signature value.private java.math.BigInteger calculateE(java.math.BigInteger n, byte[] message)